420410261 has 4 divisors (see below), whose sum is σ = 438688992. Its totient is φ = 402131532.

The previous prime is 420410227. The next prime is 420410267. The reversal of 420410261 is 162014024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 420410261 - 2⁶ = 420410197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420410267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9139331 + ... + 9139376.

It is an arithmetic number, because the mean of its divisors is an integer number (109672248).

Almost surely, 2^420410261 is an apocalyptic number.

It is an amenable number.

420410261 is a deficient number, since it is larger than the sum of its proper divisors (18278731).

420410261 is a wasteful number, since it uses less digits than its factorization.

420410261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18278730.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 420410261 is about 20503.9084322965. The cubic root of 420410261 is about 749.1310000261.

Adding to 420410261 its reverse (162014024), we get a palindrome (582424285).

The spelling of 420410261 in words is "four hundred twenty million, four hundred ten thousand, two hundred sixty-one".